<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<meta name="generator" content="Hexo 5.4.0">
  <link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png">
  <link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png">
  <link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png">
  <link rel="mask-icon" href="/images/logo.svg" color="#222">

<link rel="stylesheet" href="/css/main.css">


<link rel="stylesheet" href="/lib/font-awesome/css/all.min.css">

<script id="hexo-configurations">
    var NexT = window.NexT || {};
    var CONFIG = {"hostname":"kelvinzhang.gitee.io","root":"/","scheme":"Gemini","version":"7.8.0","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12,"onmobile":false},"copycode":{"enable":false,"show_result":false,"style":null},"back2top":{"enable":true,"sidebar":false,"scrollpercent":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"algolia":{"hits":{"per_page":10},"labels":{"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}},"localsearch":{"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}}};
  </script>

  <meta name="description" content="LazyScrollView简介 LazyScrollView 继承自ScrollView，目标是解决异构（与TableView的同构对比）滚动视图的复用回收问题。它可以支持跨View层的复用，用易用方式来生成一个高性能的滚动视图。此方案最先在天猫iOS客户端的首页落地。   —-苹果核 - iOS 高性能异构滚动视图构建方案 —— LazyScrollView  在这篇文章中，博主详细介绍了La">
<meta property="og:type" content="article">
<meta property="og:title" content="iOS 高性能异构滚动视图-LazyScrollView实现">
<meta property="og:url" content="https://kelvinzhang.gitee.io/2016/12/08/iOS-%E9%AB%98%E6%80%A7%E8%83%BD%E5%BC%82%E6%9E%84%E6%BB%9A%E5%8A%A8%E8%A7%86%E5%9B%BE-LazyScrollView%E5%AE%9E%E7%8E%B0/index.html">
<meta property="og:site_name" content="猿创日记">
<meta property="og:description" content="LazyScrollView简介 LazyScrollView 继承自ScrollView，目标是解决异构（与TableView的同构对比）滚动视图的复用回收问题。它可以支持跨View层的复用，用易用方式来生成一个高性能的滚动视图。此方案最先在天猫iOS客户端的首页落地。   —-苹果核 - iOS 高性能异构滚动视图构建方案 —— LazyScrollView  在这篇文章中，博主详细介绍了La">
<meta property="og:locale" content="zh_CN">
<meta property="article:published_time" content="2016-12-08T12:08:14.000Z">
<meta property="article:modified_time" content="2021-08-26T11:56:30.556Z">
<meta property="article:author" content="Kelvin">
<meta property="article:tag" content="LazyScrollView">
<meta property="article:tag" content="高性能">
<meta name="twitter:card" content="summary">

<link rel="canonical" href="https://kelvinzhang.gitee.io/2016/12/08/iOS-%E9%AB%98%E6%80%A7%E8%83%BD%E5%BC%82%E6%9E%84%E6%BB%9A%E5%8A%A8%E8%A7%86%E5%9B%BE-LazyScrollView%E5%AE%9E%E7%8E%B0/">


<script id="page-configurations">
  // https://hexo.io/docs/variables.html
  CONFIG.page = {
    sidebar: "",
    isHome : false,
    isPost : true,
    lang   : 'zh-CN'
  };
</script>

  <title>iOS 高性能异构滚动视图-LazyScrollView实现 | 猿创日记</title>
  






  <noscript>
  <style>
  .use-motion .brand,
  .use-motion .menu-item,
  .sidebar-inner,
  .use-motion .post-block,
  .use-motion .pagination,
  .use-motion .comments,
  .use-motion .post-header,
  .use-motion .post-body,
  .use-motion .collection-header { opacity: initial; }

  .use-motion .site-title,
  .use-motion .site-subtitle {
    opacity: initial;
    top: initial;
  }

  .use-motion .logo-line-before i { left: initial; }
  .use-motion .logo-line-after i { right: initial; }
  </style>
</noscript>

</head>

<body itemscope itemtype="http://schema.org/WebPage">
  <div class="container use-motion">
    <div class="headband"></div>

    <header class="header" itemscope itemtype="http://schema.org/WPHeader">
      <div class="header-inner"><div class="site-brand-container">
  <div class="site-nav-toggle">
    <div class="toggle" aria-label="切换导航栏">
      <span class="toggle-line toggle-line-first"></span>
      <span class="toggle-line toggle-line-middle"></span>
      <span class="toggle-line toggle-line-last"></span>
    </div>
  </div>

  <div class="site-meta">

    <a href="/" class="brand" rel="start">
      <span class="logo-line-before"><i></i></span>
      <h1 class="site-title">猿创日记</h1>
      <span class="logo-line-after"><i></i></span>
    </a>
  </div>

  <div class="site-nav-right">
    <div class="toggle popup-trigger">
    </div>
  </div>
</div>




<nav class="site-nav">
  <ul id="menu" class="main-menu menu">
        <li class="menu-item menu-item-home">

    <a href="/" rel="section"><i class="fa fa-home fa-fw"></i>首页</a>

  </li>
        <li class="menu-item menu-item-about">

    <a href="/about/" rel="section"><i class="fa fa-user fa-fw"></i>关于</a>

  </li>
  </ul>
</nav>




</div>
    </header>

    
  <div class="back-to-top">
    <i class="fa fa-arrow-up"></i>
    <span>0%</span>
  </div>
  <div class="reading-progress-bar"></div>

  <a href="https://github.com/KelvinQQ" class="github-corner" title="Follow me on GitHub" aria-label="Follow me on GitHub" rel="noopener" target="_blank"><svg width="80" height="80" viewBox="0 0 250 250" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a>


    <main class="main">
      <div class="main-inner">
        <div class="content-wrap">
          

          <div class="content post posts-expand">
            

    
  
  
  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
    <link itemprop="mainEntityOfPage" href="https://kelvinzhang.gitee.io/2016/12/08/iOS-%E9%AB%98%E6%80%A7%E8%83%BD%E5%BC%82%E6%9E%84%E6%BB%9A%E5%8A%A8%E8%A7%86%E5%9B%BE-LazyScrollView%E5%AE%9E%E7%8E%B0/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="image" content="/images/avatar.gif">
      <meta itemprop="name" content="Kelvin">
      <meta itemprop="description" content="">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="猿创日记">
    </span>
      <header class="post-header">
        <h1 class="post-title" itemprop="name headline">
          iOS 高性能异构滚动视图-LazyScrollView实现
        </h1>

        <div class="post-meta">
            <span class="post-meta-item">
              <span class="post-meta-item-icon">
                <i class="far fa-calendar"></i>
              </span>
              <span class="post-meta-item-text">发表于</span>

              <time title="创建时间：2016-12-08 20:08:14" itemprop="dateCreated datePublished" datetime="2016-12-08T20:08:14+08:00">2016-12-08</time>
            </span>
              <span class="post-meta-item">
                <span class="post-meta-item-icon">
                  <i class="far fa-calendar-check"></i>
                </span>
                <span class="post-meta-item-text">更新于</span>
                <time title="修改时间：2021-08-26 19:56:30" itemprop="dateModified" datetime="2021-08-26T19:56:30+08:00">2021-08-26</time>
              </span>
            <span class="post-meta-item">
              <span class="post-meta-item-icon">
                <i class="far fa-folder"></i>
              </span>
              <span class="post-meta-item-text">分类于</span>
                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
                  <a href="/categories/iOS/" itemprop="url" rel="index"><span itemprop="name">iOS</span></a>
                </span>
            </span>

          

        </div>
      </header>

    
    
    
    <div class="post-body" itemprop="articleBody">

      
        <h2 id="LazyScrollView简介"><a href="#LazyScrollView简介" class="headerlink" title="LazyScrollView简介"></a><code>LazyScrollView</code>简介</h2><blockquote>
<p>LazyScrollView 继承自ScrollView，目标是解决异构（与TableView的同构对比）滚动视图的复用回收问题。它可以支持跨View层的复用，用易用方式来生成一个高性能的滚动视图。此方案最先在天猫iOS客户端的首页落地。</p>
</blockquote>
<blockquote>
<p>—-<a target="_blank" rel="noopener" href="http://pingguohe.net/2016/01/31/lazyscroll.html">苹果核 - iOS 高性能异构滚动视图构建方案 —— LazyScrollView</a></p>
</blockquote>
<p>在<a target="_blank" rel="noopener" href="http://pingguohe.net/2016/01/31/lazyscroll.html">这篇文章</a>中，博主详细介绍了LazyScrollView的使用和实现方案，但是并没有给出具体DEMO，这里只是站在巨人的肩膀上，给一个DEMO，同时也希望可以抛砖引玉。</p>
<span id="more"></span>

<h2 id="LazyScrollView使用"><a href="#LazyScrollView使用" class="headerlink" title="LazyScrollView使用"></a><code>LazyScrollView</code>使用</h2><p>暂时的实现比较简陋，目前只有一个<code>id&lt;LazyScrollViewDataSource&gt; dataSource;</code>，需要实现下面三个接口：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">@protocol LazyScrollViewDataSource &lt;NSObject&gt;</span><br><span class="line">@required</span><br><span class="line">// ScrollView一共展示多少个item</span><br><span class="line">- (NSUInteger)numberOfItemInScrollView:(LazyScrollView *)scrollView;</span><br><span class="line">// 要求根据index直接返回RectModel</span><br><span class="line">- (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index;</span><br><span class="line">// 返回下标所对应的view</span><br><span class="line">- (UIView *)scrollView:(LazyScrollView *)scrollView itemByLsvId:(NSString *)lsvId;</span><br><span class="line">@end</span><br></pre></td></tr></table></figure>
<p>其中<code>LSVRectModel</code>就是原文中的<code>TMMuiRectModel</code>：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@interface LSVRectModel : NSObject</span><br><span class="line">// 转换后的绝对值rect</span><br><span class="line">@property (nonatomic, assign) CGRect absRect;</span><br><span class="line">// 业务下标</span><br><span class="line">@property (nonatomic, copy) NSString *lsvId;</span><br><span class="line">+ (instancetype)modelWithRect:(CGRect)rect lsvId:(NSString *)lsvId;</span><br><span class="line">@end</span><br></pre></td></tr></table></figure>
<p>三个接口都很简单，和<code>UITableView</code>很类似，如果有不清楚，可以在底部查看DEMO或者原文。</p>
<p>另外，<code>LazyScrollView</code>提供了三个接口，也都是仿照<code>UITableView</code>来的，所以整个<code>LazyScrollView</code>的使用应该是很容易上手的：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">- (void)reloadData;</span><br><span class="line">- (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier;</span><br><span class="line">- (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier;</span><br></pre></td></tr></table></figure>
<h2 id="LazyScrollView实现"><a href="#LazyScrollView实现" class="headerlink" title="LazyScrollView实现"></a><code>LazyScrollView</code>实现</h2><p>最主要的思路就是复用，所以有两个<code>View</code>池：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">@property (nonatomic, strong) NSMutableDictionary&lt;NSString *, NSMutableSet *&gt; *reuseViews;</span><br><span class="line">@property (nonatomic, strong) NSMutableSet&lt;__kindof UIView *&gt; *visibleViews;</span><br></pre></td></tr></table></figure>
<p>由于每个<code>View</code>可能对应不同的identifier，所以<code>reuseViews</code>是一个<code>NSMutableDictionary</code>。<br>当一个<code>View</code>滑出可见区域之后，会将它先从<code>visibleViews</code>中移除，然后添加到<code>reuseViews</code>中，并从<code>LazyScrollView</code>中 <em>remove</em>，即调用<code>removeFromSuperview</code>。这个地方在原文中作者的表述可能让大家误会了。</p>
<blockquote>
<p>LazyScrollView中有一个Dictionary，key是reuseIdentifier,Value是对应reuseIdentifier被回收的View，当LazyScrollView得知这个View不该再出现了，会把View放在这里，并且把这个View hidden掉。</p>
</blockquote>
<p>这里作者用的是<code>hidden掉</code>，但是我们知道，<code>hidden</code>只是控制显隐，<code>View</code>本身还是在那里，也无法去复用。</p>
<p>而当一个View滑到可见区域内时，需要先从<code>reuseViews</code>中复用，如果<code>reuseViews</code>没有，则重新创建一个。相关实现请看<code>- (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier;</code>。</p>
<p>最后一个问题就是如何判断一个<code>View</code>是在可见区域内的。这里原文中说的很清晰，还有图片配合。建议大家还是移步原文。这里我简单说一下，找到顶边大于<code>contentOffset.y - BUFFER_HEIGHT</code>，底边小于<code>contentOffset.y+CGRectGetHeight(self.bounds) + BUFFER_HEIGHT</code>，然后两个集合取交集就是需要显示的<code>View</code>集合了。<br>当然，这里有一些处理算法：</p>
<ul>
<li>对 <strong>顶边</strong> 做升序处理得到一个集合，对 <strong>底边</strong> 降序处理得到一个集合。</li>
<li>采用二分法查找合适的位置，然后再对上一步得到的集合取子集即可。</li>
</ul>
<p>好了，说了这么多，先放出DEMO地址吧，希望大家可以帮助完善，也希望可以给个Star。<br><a target="_blank" rel="noopener" href="https://github.com/HistoryZhang/LazyScrollView">https://github.com/HistoryZhang/LazyScrollView</a>。<br>原文地址：<a target="_blank" rel="noopener" href="http://pingguohe.net/2016/01/31/lazyscroll.html">苹果核 - iOS 高性能异构滚动视图构建方案 —— LazyScrollView</a>（里面还有很多干货）。</p>
<p>最后说一下目前写的几个问题，希望大家可以一起来优化：</p>
<ol>
<li>没有处理<code>View</code>点击事件，即没有写<code>delegate</code>回调。</li>
<li>二分法查找合适位置的时候算法待优化。</li>
<li>从旧的<code>visibleViews</code>中移除被滑出的<code>View</code>算法待优化。</li>
</ol>
<p>贴一段第二个问题的代码：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">- (NSMutableSet *)findSetWithMinEdge:(CGFloat)minEdge &#123;</span><br><span class="line">    NSArray *ascendingEdgeArray =</span><br><span class="line">    [self.allRects sortedArrayUsingComparator:^NSComparisonResult(LSVRectModel *obj1, LSVRectModel *obj2) &#123;</span><br><span class="line">        return CGRectGetMinY(obj1.absRect) &gt; CGRectGetMinY(obj2.absRect) ? NSOrderedDescending : NSOrderedAscending;</span><br><span class="line">    &#125;];</span><br><span class="line">    </span><br><span class="line">    // TOOD: 此处待优化</span><br><span class="line">    // 二分法</span><br><span class="line">    NSInteger minIndex = 0;</span><br><span class="line">    NSInteger maxIndex = ascendingEdgeArray.count - 1;</span><br><span class="line">    NSInteger midIndex = (minIndex + maxIndex) / 2;</span><br><span class="line">    LSVRectModel *model = ascendingEdgeArray[midIndex];</span><br><span class="line">    while (minIndex &lt; maxIndex - 1) &#123;</span><br><span class="line">        if (CGRectGetMinY(model.absRect) &gt; minEdge) &#123;</span><br><span class="line">            maxIndex = midIndex;</span><br><span class="line">        &#125;</span><br><span class="line">        else &#123;</span><br><span class="line">            minIndex = midIndex;</span><br><span class="line">        &#125;</span><br><span class="line">        midIndex = (minIndex + maxIndex) / 2;</span><br><span class="line">        model = ascendingEdgeArray[midIndex];</span><br><span class="line">    &#125;</span><br><span class="line">    midIndex = MAX(midIndex - 1, 0);</span><br><span class="line">    NSArray *array = [ascendingEdgeArray subarrayWithRange:NSMakeRange(midIndex, ascendingEdgeArray.count - midIndex)];</span><br><span class="line">    return [NSMutableSet setWithArray:array];</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>再贴一段第三个问题的代码：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">    NSMutableArray *newVisibleViews = [self visiableViewModels].mutableCopy;</span><br><span class="line">    NSMutableArray *newVisibleLsvIds = [newVisibleViews valueForKey:@&quot;lsvId&quot;];</span><br><span class="line">    NSMutableArray *removeViews = [NSMutableArray array];</span><br><span class="line">    for (UIView *view in self.visibleViews) &#123;</span><br><span class="line">        if (![newVisibleLsvIds containsObject:view.lsvId]) &#123;</span><br><span class="line">            [removeViews addObject:view];</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    for (UIView *view in removeViews) &#123;</span><br><span class="line">        [self.visibleViews removeObject:view];</span><br><span class="line">        [self enqueueReusableView:view];</span><br><span class="line">        [view removeFromSuperview];</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
    </div>

    
    
    

      <footer class="post-footer">
          <div class="post-tags">
              <a href="/tags/LazyScrollView/" rel="tag"># LazyScrollView</a>
              <a href="/tags/%E9%AB%98%E6%80%A7%E8%83%BD/" rel="tag"># 高性能</a>
          </div>

        


        
    <div class="post-nav">
      <div class="post-nav-item">
    <a href="/2016/11/01/iOS%E5%88%9B%E5%BB%BA%E5%8D%95%E4%BE%8B/" rel="prev" title="iOS创建单例">
      <i class="fa fa-chevron-left"></i> iOS创建单例
    </a></div>
      <div class="post-nav-item">
    <a href="/2016/12/30/%E5%BC%80%E6%BA%90%E5%8D%8F%E8%AE%AE%E7%9F%A5%E5%A4%9A%E5%B0%91/" rel="next" title="开源协议知多少">
      开源协议知多少 <i class="fa fa-chevron-right"></i>
    </a></div>
    </div>
      </footer>
    
  </article>
  
  
  



          </div>
          

<script>
  window.addEventListener('tabs:register', () => {
    let { activeClass } = CONFIG.comments;
    if (CONFIG.comments.storage) {
      activeClass = localStorage.getItem('comments_active') || activeClass;
    }
    if (activeClass) {
      let activeTab = document.querySelector(`a[href="#comment-${activeClass}"]`);
      if (activeTab) {
        activeTab.click();
      }
    }
  });
  if (CONFIG.comments.storage) {
    window.addEventListener('tabs:click', event => {
      if (!event.target.matches('.tabs-comment .tab-content .tab-pane')) return;
      let commentClass = event.target.classList[1];
      localStorage.setItem('comments_active', commentClass);
    });
  }
</script>

        </div>
          
  
  <div class="toggle sidebar-toggle">
    <span class="toggle-line toggle-line-first"></span>
    <span class="toggle-line toggle-line-middle"></span>
    <span class="toggle-line toggle-line-last"></span>
  </div>

  <aside class="sidebar">
    <div class="sidebar-inner">

      <ul class="sidebar-nav motion-element">
        <li class="sidebar-nav-toc">
          文章目录
        </li>
        <li class="sidebar-nav-overview">
          站点概览
        </li>
      </ul>

      <!--noindex-->
      <div class="post-toc-wrap sidebar-panel">
          <div class="post-toc motion-element"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#LazyScrollView%E7%AE%80%E4%BB%8B"><span class="nav-number">1.</span> <span class="nav-text">LazyScrollView简介</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#LazyScrollView%E4%BD%BF%E7%94%A8"><span class="nav-number">2.</span> <span class="nav-text">LazyScrollView使用</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#LazyScrollView%E5%AE%9E%E7%8E%B0"><span class="nav-number">3.</span> <span class="nav-text">LazyScrollView实现</span></a></li></ol></div>
      </div>
      <!--/noindex-->

      <div class="site-overview-wrap sidebar-panel">
        <div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
  <p class="site-author-name" itemprop="name">Kelvin</p>
  <div class="site-description" itemprop="description"></div>
</div>
<div class="site-state-wrap motion-element">
  <nav class="site-state">
      <div class="site-state-item site-state-posts">
          <a href="/archives">
          <span class="site-state-item-count">57</span>
          <span class="site-state-item-name">日志</span>
        </a>
      </div>
      <div class="site-state-item site-state-categories">
            <a href="/categories/">
        <span class="site-state-item-count">11</span>
        <span class="site-state-item-name">分类</span></a>
      </div>
      <div class="site-state-item site-state-tags">
            <a href="/tags/">
        <span class="site-state-item-count">56</span>
        <span class="site-state-item-name">标签</span></a>
      </div>
  </nav>
</div>
  <div class="links-of-author motion-element">
      <span class="links-of-author-item">
        <a href="https://github.com/KelvinQQ" title="GitHub → https:&#x2F;&#x2F;github.com&#x2F;KelvinQQ" rel="noopener" target="_blank"><i class="fab fa-github fa-fw"></i>GitHub</a>
      </span>
      <span class="links-of-author-item">
        <a href="mailto:history_zq@163.com" title="E-Mail → mailto:history_zq@163.com" rel="noopener" target="_blank"><i class="fa fa-envelope fa-fw"></i>E-Mail</a>
      </span>
  </div>



      </div>

    </div>
  </aside>
  <div id="sidebar-dimmer"></div>


      </div>
    </main>

    <footer class="footer">
      <div class="footer-inner">
        

        

<div class="copyright">
  
  &copy; 
  <span itemprop="copyrightYear">2021</span>
  <span class="with-love">
    <i class="fa fa-heart"></i>
  </span>
  <span class="author" itemprop="copyrightHolder">Kelvin</span>
</div>
  <div class="powered-by">由 <a href="https://hexo.io/" class="theme-link" rel="noopener" target="_blank">Hexo</a> & <a href="https://theme-next.org/" class="theme-link" rel="noopener" target="_blank">NexT.Gemini</a> 强力驱动
  </div>

        








      </div>
    </footer>
  </div>

  
  <script src="/lib/anime.min.js"></script>
  <script src="/lib/velocity/velocity.min.js"></script>
  <script src="/lib/velocity/velocity.ui.min.js"></script>

<script src="/js/utils.js"></script>

<script src="/js/motion.js"></script>


<script src="/js/schemes/pisces.js"></script>


<script src="/js/next-boot.js"></script>




  















  

  

<script src="/live2dw/lib/L2Dwidget.min.js?094cbace49a39548bed64abff5988b05"></script><script>L2Dwidget.init({"pluginRootPath":"live2dw/","pluginJsPath":"lib/","pluginModelPath":"assets/","tagMode":false,"log":false,"model":{"jsonPath":"live2d-widget-models\\packages\\live2d-widget-model-miku"},"display":{"position":"right","width":150,"height":300},"mobile":{"show":true}});</script></body>
</html>
